Abstract
By crossing an amphiploid (T. timopheevii×H. bogdanii)2 as maternal parent with another amphiploid (H. californicum×T. aestivum) four hybrid plants were recovered at a frequency of 2.4% of the pollinated florets. The meiotic analysis of the data revealed a mean chiasmata frequency per cell in four hybrid combinations ranging from 7.61 to 8.63. Average chromosome associations of 6.12 bivalents, 0.33 trivalents and 0.007 quadrivalents per cell were observed at metaphase I. The lower than expected bivalent frequency in the septavalent hybrid (2n=7x=49, AABDGHH) was attributed to the suppression of meiotic chromosome pairing by H. californicum.
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